Slide fastener with seperable bottom end stop

ABSTRACT

A slide fastener with a separable bottom end stop enabling a reinforcement portion of the separable bottom end stop to be sewed securely and ribs at a sewing position not to be damaged by a sewing needle. The reinforcement portion formed integrally on a lower half portion of each of a box pin and an insert pin of the separable bottom end stop using synthetic resin is exposed on the fastener tape and constituted of an auxiliary member and ribs formed at a sewing position to be sewed to a sewing object. The rib is formed like its height is 0.5 to 0.85 mm and width 0.6 to 0.9 mm, expanded gradually from a vertex to a base portion. A gap portion, wider than the base portion of the rib, is formed between adjoining ribs, therefore the rib avoids strike of a sewing needle not to be damaged thereby and the gap portion ensures sewing of the fastener tape onto the sewing object.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a configuration of areinforcement portion for reinforcing a fastener tape located beside abox pin or an insert pin attached to an end portion of the fastener tapein a separable bottom stop end provided on a slide fastener.

[0003] 2. Description of the Related Art

[0004] In recent years, provision of a product having a simplifiedstructure, which realizes a cheap price and excellent quality, has beendemanded by the slide fastener field in the market. This tendency isremarkably apparent in a slide fastener with a separable bottom end stopwhich is used in an opening/closing section in the front body of clothesand capable of connecting or disconnecting end portions of fastenertapes.

[0005] Conventionally, in an ordinary product of the slide fastener withthe separable bottom end stop, fastener elements are attached alongopposing side edges of a pair of fastener tapes and separable bottom endstops each constituted of a box pin, a box and an insert pin areattached to the bottom end of the fastener elements. Then, areinforcement tape in which an adhesive layer is provided on the rearface of a plain woven fabric (taffeta) or synthetic resin film is bondedto the fastener tape at a portion to be provided with the separablebottom stop end in order to reinforce the portion for stabilization andthen, the separable bottom stop end is attached.

[0006] The slide fastener with separable bottom stop end having thereinforcement tape requires the reinforcement tape in order to reinforcethe fastener tape so that the quantity of components of the slidefastener increases thereby increasing product cost. Further, because astep of bonding the reinforcement tape and a bonding machine are alwaysrequired in a process for manufacturing the slide fastener and thus, themanufacturing process cannot be simplified, an increase in product costis induced.

[0007] On the other hand, for example, UK Patent No. 988659 hasdisclosed a separable bottom end stop for a slide fastener in which theseparable bottom end stop and a reinforcement portion having plural ribsare formed integrally with the both the front and rear faces of afastener tape using synthetic resin without attaching a reinforcementtape to the end portion of the fastener tape.

[0008] Although in this slide fastener with the separable bottom endstop disclosed in this publication, its rib is permitted to be formedinto any shape in its section, no improvement about a collision betweenthe rib and a sewing needle which may occur at the time of sewing on asewing object such as clothes is achieved. Consequently, the frequencythat the rib may be damaged by a strike with the sewing needle is highand the damaged portion may be protruded from a matching portion betweenthe fastener tape and the object clothes, thereby possibly injuring theskin of a wearer.

[0009] The present invention has been achieved in views of theabove-described problem and a first object of the present invention isto improve the way for sewing a slide fastener with a separable bottomend stop on a sewing object such as clothes and specifically, to providea slide fastener with a separable bottom end stop which enables itselfto be sewed easily and securely and is capable of preventing areinforcement portion from being damaged by a collision between a sewingneedle and ribs and allows a separation operation of the separablebottom end stop to be carried smoothly.

[0010] In addition to the above object, a second object of the presentinvention is to provide the slide fastener with the separable bottom endstop which, even if the sewing needle makes contact with the rib in thereinforcement portion at the time of sewing, deflects the sewing needlefrom the rib effectively so as to sew the slide fastener onto a sewingobject securely, thereby ensuring an excellent texture to the skin.

[0011] In addition to the above objects, a third object of the presentinvention is to provide the slide fastener with the separable bottom endstop capable of sewing the reinforcement portion securely andeffectively without any trouble at the time of sewing. A fourth objectof the present invention is to provide the slide fastener with theseparable bottom end stop in which the rib of the reinforcement portionhas an ideal slope thereby preventing the rib from being damaged by asewing needle at the time of sewing and capable of sewing the rib of thereinforcement portion smoothly.

[0012] A fifth object of the present invention is to provide the slidefastener with the separable bottom end stop which, if the sewing line isapart from an opening, enables a large size slide fastener to be sewedappropriately and effectively.

[0013] A sixth object of the present invention is to provide the slidefastener with the separable bottom end stop which, if the sewing line isin the vicinity of an opening, enables a small size slide fastener to besewed appropriately and effectively.

[0014] A seventh object of the present invention is to provide the slidefastener with the separable bottom end stop in which the ribs of thereinforcement portions are provided symmetrically on both the front andrear faces of the fastener tape so as to enable sewing from any sidesthereby preventing the ribs from being damaged by a collision of thesewing needle.

SUMMARY OF THE INVENTION

[0015] According to the present invention, to achieve the above object,fastener elements are attached to opposing side edges of a pair of thefastener tapes and there are provided a separable bottom end stop madeof synthetic resin, for example, a box pin, a box and an insert pin,which is attached by integral molding to the side edge of the fastenertape at an end portion of the fastener elements, and a reinforcementportion formed integrally with the separable bottom end stop such thatthey are exposed on at least one face of the fastener tape in order toreinforce the fastener tape. The reinforcement portions are formed ofplural ribs connected to the separable bottom end stop. The ribs areformed at a sewing position to an sewing object, for example, clothes,such that its height H is 0.5 to 0.85 mm and its width W is 0.6 to 0.9mm and that they are expanded gradually from a vertex to the baseportion. There is provided a gap portion wider than the base portion ofthe rib between the ribs. Consequently, this slide fastener with theseparable bottom end stop enables the reinforcement portion constitutedof the ribs to be sewed easily and effectively.

[0016] In addition to this configuration, the ribs at the sewingposition in the reinforcement portion are provided with a chamferingportion whose vertex is chamfered and preferably, this chamferingportion is formed into an arc-like configuration in which the radius ofits lateral sectional shape is 0.05 to 0.1 mm.

[0017] Further, in addition to the basic configuration of the presentinvention, the size of the gap portion formed between the adjacent ribsat the sewing position in the reinforcement portion is preferred to be2.0 to 2.5 mm and the respective ribs are preferred to be disposed inparallel in the width direction of the fastener tape.

[0018] In addition to the above-described basic configuration, the ribsat the sewing position in the reinforcement portion is preferred tosatisfy the condition in which tan θ=H/(W/2), which is an degree of aninclination of the rib on its base portion, is from 1.1 to 2.9. That is,the inclination angle θ of the rib on its base portion, which isdisposed at the sewing position in the reinforcement portion, ispreferred to be in a range of 55° to 70°.

[0019] Furthermore, in addition to the above-described configuration,the ribs at the sewing position in the reinforcement portion ispreferred to be disposed on the side face of the separable bottom endstop, attached to the side edge of the fastener tape, through anauxiliary member formed in a flat shape or in various kinds of shapes.

[0020] Moreover, the ribs at the sewing position in the reinforcementportion may be disposed on the side face of the separable bottom endstop, attached to the side edge of the fastener tape, directly notthrough any auxiliary member. The ribs at the sewing position in thereinforcement portion may be disposed symmetrically on both front andrear surfaces of the fastener tape so as to sandwich the fastener tape.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021]FIG. 1 is a front view of major portions of a slide fastener witha separable bottom end stop;

[0022]FIG. 2 is a front view of major portions of a fastener stringerloaded with a box pin;

[0023]FIG. 3 is a bottom view of the fastener stringer;

[0024]FIG. 4 is a sectional view taken along line A-A (IV-IV) in FIG. 3;

[0025]FIG. 5 is an enlarged sectional view of a rib;

[0026]FIG. 6 is a front view of major portions of a fastener stringerloaded with an insert pin;

[0027]FIG. 7 is a bottom view of the same fastener stringer;

[0028]FIG. 8 is a sectional view of a box;

[0029]FIG. 9 is a sectional view taken along line B-B (IX-IX) in FIG. 8;

[0030]FIG. 10 is a partially broken front view of a state in which thebox and the box pin are connected;

[0031]FIG. 11 is a partially broken front view showing a state in whichthe fastener stringer loaded with the insert pin is engaged with thefastener stringer loaded with the box;

[0032]FIG. 12 is a partially broken front view showing a state in whichthe fastener stringer loaded with the insert pin is engaged with thefastener stringer loaded with the box;

[0033]FIG. 13 is a front view of major portions showing a state in whicha fastener chain is sewed to a sewing object;

[0034]FIG. 14 is a sectional view taken along line C-C (XIV-XIV) in FIG.13;

[0035]FIG. 15 is a front view of the separable bottom end stop showing amodification of the reinforcement portion;

[0036]FIG. 16 is a front view of the separable bottom end stop showinganother modification of the reinforcement portion;

[0037]FIG. 17 is a partially broken front view of a bottom end stop inwhich the box and the box pin are integrated;

[0038]FIG. 18 is a front view showing a modification of thereinforcement portion loaded with the box pin;

[0039]FIG. 19 is a front view showing another modification of thereinforcement portion loaded with the box pin; and

[0040]FIG. 20 is a front view of major portions in another slidefastener with a separable bottom end stop.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] Hereinafter, preferred embodiments of a slide fastener with aseparable bottom end stop of the present invention will be describedwith reference to the drawings.

[0042] As shown in FIG. 1, in the slide fastener with the separablebottom end stop, a fastener chain 1 is not a closed product with abottom stop end but an openable product, that is, provided with aseparable bottom end stop 5 which enables right and left fastenerstringers 2 to be separated completely. Fastener elements 4 are mountedon a core portion 6 provided on the side edge of a fastener tape 3. Abox pin 8 as the separable bottom end stop 5 is mounted on the coreportion 6 continuously with the bottom end of the fastener element 4 ofone side fastener stringer 2 and an insert pin 9 as the separable bottomend stop 5 is mounted on the core portion 6 continuously with the bottomend of the fastener element 4 of the other fastener stringer 2. As shownin FIG. 10, the fastener stringer 2 with the separable bottom end stopprovided with the box pin 8 and a box 7 is produced and combined withthe fastener stringer 2 loaded with the insert pin 9 so as to completethe slide fastener with the separable bottom end stop.

[0043] In the slide fastener with the separable bottom end stopaccording to a first embodiment shown in FIGS. 2 to 12, a flatreinforcement portion 10 is provided integrally with a side face of thebox pin 8 attached to one side fastener stringer 2 of the fastener chain1 such that it is exposed on the surface of the fastener tape 3 as shownin FIG. 2. On the other hand, a flat reinforcement portion 10 isprovided integrally with a side face of the insert pin 9 attached to theother fastener stringer 2 such that it is exposed on the surface of thefastener tape 3 as shown in FIG. 6. The fastener elements 4, box pin 8,insert pin 9, box 7 and reinforcement portion 10 in the fastener chain 1are formed integrally with the fastener tape 3 by injection moldingmeans using thermoplastic resin such as polyacetal and polyamide.

[0044] As shown in FIGS. 2, 3, 6 and 7, the box pin 8 and insert pin 9are provided with the reinforcement portions 10 which are protrudedoutward from the side face thereof while the surfaces thereof areextended flatly. As shown in FIGS. 2 and 3, in the reinforcement portion10 on the box pin 8, plural ribs 13 as an auxiliary member 11 aredisposed obliquely such that they are protruded outward from the sideface of a lower half of the box pin 8 on the fastener tape 3 and aconcave portion 14 is formed among these ribs 13 disposed obliquely. Theconcave portion 14 is formed in various kinds of shapes, such as square,diamond, circle or oval and into a through-hole configuration.Consequently, the ribs 13 and the concave portion 14 are provided withflexibility and the intersecting portion of the ribs 13 is formed intoan arc-like configuration such as circular one so as to scatter anexternal force applied to the reinforcement portion 10.

[0045] As for the size of the auxiliary member 11, the width of thefastener tape 3 in slide fasteners No. 3 to 5 often used usually is 13to 16 mm and the size thereof is preferred to be within about 30% thewidth of this fastener tape 3. The size of the auxiliary member 11 canbe changed freely depending on the size of the slide fastener orcustomer's demand. As the auxiliary member 11, the ribs 13 may bedisposed in parallel in the width direction of the fastener tape 3 or itmay be a flat plate also, instead of the rib structure. Further, acut-out 15, which is dented upward, is provided in the bottom edge ofthe auxiliary member 11 in the reinforcement portion 10 so as to absorbpart of an external force with the cut-out 15 when a twisting force orthe like is applied to the end portion of the fastener tape 3. In themeantime, the cut-out 15 may be provided in the top edge of theauxiliary member 11 also.

[0046] The ribs 13 are formed at a sewing position 40 for sewing onto asewing object such as clothes in the outside portion of thereinforcement portion 10. In this rib 13, as shown in FIG. 2, pluralribs 13 are disposed in parallel in the width direction of the fastenertape 3 and the proximal ends of the ribs 13 are connected integrally tothe auxiliary member 11. The front ends of the ribs 13 are extended upto the vicinity of the fastener tape 3 and the end portions of therespective ribs 13 are connected so as to form a frame 16. The rib 13 isformed thicker than the auxiliary member 11 as shown in FIG. 3.

[0047] The ribs 13 existing at the sewing position 40 indicate asubstantially isosceles triangle having a pair of slopes as shown inFIGS. 4 and 5 and are protruded symmetrically from both the front andrear surfaces of the fastener tape 3. As for the specific configurationof the rib 13, the width W of a base portion 20 in contact with thefastener tape 3, that is, of the bottom portion is 0.6 to 0.9 mm and theheight H thereof is in a range of 0.5 to 0.85 mm. The width of the rib13 is expanded gradually from a vertex 19 of the rib 13 up to the baseportion 20 and an inclination angle θ on the base portion 20 of the rib13 is obtained based on the expression tan θ=H/(W/2) using the ribheight H and width W. Accordingly, the inclination angle θ is in arelation of 1.1≦tan θ≦2.9 and in a range of 47° to 71°. Preferably, theinclination angle θ is in a range of 55° to 70°. The vertex 19 of therib 13 is chamfered to form a chamfered portion 21 and preferably, thischamfered portion 21 is formed into a circular shape having a curvatureradius of 0.05 to 0.1 mm in its sectional shape of the rib 13. The rib13 having this configuration is capable of shifting the front tip of asewing needle 41 to a slope 22 of the rib 13 easily even if the sewingneedle 41 makes contact with the rib 13 when a sewing line is formedwith the sewing machine, thereby preventing the rib 13 from beingdamaged. Further, the slope 22 may be curved into a slight arc-likeconfiguration instead of a flat face.

[0048] Because the ribs 13 are formed symmetrically on both the frontand rear surfaces of the fastener tape 3 at the sewing position 40 asshown in FIG. 4, the ribs 13 are protected from a damage due to a strikeof the sewing needle 41 even if sewing operation is carried out from anyside. At the sewing position 40, gap portions 23 are provided betweenadjacent ribs 13 in the length direction of the fastener tape 3 so as tofacilitate sewing of the reinforcement portion 10. The gap S is measuredbetween the base portions 20 of the ribs 13 and the size S of the gapportion 23 is recommended to be 2.0 to 2.5 mm. When the fastener tape 3is sewed to the sewing object 42, the size d of the sewing needle 41 foruse is 0.92 to 1.02 mm. If it is considered that the sewing needle 41 ispierced into the fastener tape 3 in the interval S between the ribs 13,the sewing needle 41 is prevented from contacting the rib 13 because theinterval S is larger than the width W of the bottom portion of the rib13 and the size d of the sewing needle 41, so that the reinforcementportion 10 can be sewed securely.

[0049] As for the configuration of the box pin 8 formed on the coreportion 6 of the fastener tape 3, a recess 17 is provided on an oppositeface to the face on which the reinforcement portion 10 is formed. Apartition plate 29 provided between a front wall 25 and a rear wall 26of the box 7 is engaged with this recess 17 so as to integrate the boxpin 8 with the box 7.

[0050] In the reinforcement portion 10 of the fastener stringer 2 loadedwith the insert pin 9, as shown in FIGS. 6 and 7, plural ribs 13 aredisposed obliquely as the auxiliary members 11 such that they areprotruded outward on the side face in the lower half portion of theinsert pin 9, that is, the fastener tape 3 like the fastener stringer 2loaded with the box pin 8. Through-hole type concave portions 14 havingno bottom portion are formed among these oblique ribs 13 so as toprovide with flexibility. Intersecting portions of the ribs 13 areformed in an arc-like shape such as circular one so as to scatter anexternal force applied to the reinforcement portion 10.

[0051] The auxiliary member 11 in the reinforcement portion 10 is formedwithin about 30% of the width of the fastener tape 3 like the fastenerstringer 2 loaded with the box pin 8. The cut-out 15 is provided in thelower edge of the auxiliary member 11 in the reinforcement portion 10 soas to absorb part of an external force such as a twisting force appliedto the end portion of the fastener tape 3 through the cut-out 15. In themeantime, the cut-out 15 may be provided on the upper edge of theauxiliary member 11.

[0052] The ribs 13 are formed outside the reinforcement portion 10 suchthat it is connected to auxiliary member 11 like the fastener stringer 2loaded with the box pin 8. This rib 13 is formed into a rib 13 thickerthan the rib 13 in the auxiliary member 11 and these ribs 13 areprovided such that they are extended in parallel with an interval towardthe outside of the fastener tape 3 and the front ends of the ribs 13 areconnected to form the frame 16.

[0053] The ribs 13 indicate a substantially isosceles triangle having apair of slopes like the rib 13 of the fastener stringer 2 loaded withthe box pin 8 shown in FIG. 5. The width W of the base portion 20 of therib 13 or its bottom portion is 0.6 to 0.9 mm and the height H is in arange of 0.5 to 0.85 mm. The width of the rib 13 is expanded graduallyfrom the vertex 19 of the rib 13 up to the base portion 20. Aninclination angle θ on the base portion 20 of the rib 13 in a relationof 1.1≦tan θ≦2.9 and in a range of 47° to 71°. Preferably, theinclination angle θ is in a range of 55° to 70°. The vertex 19 of therib 13 is chamfered to form the chamfered portion 21 and preferably,this chamfered portion 21 is formed into a circular shape having acurvature radius of 0.05 to 0.1 mm in its sectional shape of the rib 13.The rib 13 shifts the front tip of the sewing needle 41 to the slope 22of the rib 13 easily even if the sewing needle 41 makes contact with therib 13 when a sewing line is formed with the sewing machine, therebypreventing the rib 13 from being damaged. Further, the surface of theslope 22 may be slightly curved instead of a flat surface.

[0054] The reinforcement portion 10 constituted of the auxiliary member11 formed in the fastener stringer 2 loaded with the box pin 8 andinsert pin 9 and the reinforcement portion 10 formed of the ribs 13 atthe sewing position 40 adjacent the auxiliary member 11 are formed onthe front and rear surfaces of the fastener tape 3 by injection moldingas shown in FIGS. 3 and 7, so that the front and rear faces of thefastener tape 3 are sandwiched by the reinforcement portions 10. Thereinforcement portions 10 may be formed on only a single face of thefastener tape 3, not on both sides.

[0055] In the box 7 to be attached to the fastener stringer 2 loadedwith the box pin 8, which is a rectangular solid, as shown in FIGS. 8and 9, a thin partition plate 29 is provided at an upper portion in thecenter between the front wall 25 and the rear wall 26 and an engagingportion 32 is provided on the bottom end of the partition plate 29. Aninsertion hole 28 which is an opening equal to the thickness of theauxiliary member 11 of the reinforcement portion 10 and through whichthe fastener stringer 2 loaded with the box pin 8 can be inserted, isprovided in the rear wall 27 located sideway of the box 7 while a boxpin insertion hole 30 through which the box pin 8 can be inserted isprovided between the insertion hole 28 and the partition plate 29. Aninsertion hole 28, which is an opening equal to the thickness of theauxiliary member 11 of the reinforcement portion 10 and through whichthe fastener stringer 2 loaded with the insert pin 9 can be inserted, isprovided up to the bottom portion while an insert pin insertion hole 31through which the insert pin 9 can be inserted is provided between theinsertion hole 28 and the partition plate 29, so that the box 7 iscompleted.

[0056] As shown in FIG. 10, the box pin 8 of the fastener stringer 2loaded with the box pin 8 is inserted into the box pin insertion hole 30in the box 7 and the auxiliary member 11 of the reinforcement portion 10is inserted into the insertion hole 28 in the side wall 27 and thepartition plate 29 provided in the box 7 is pressed into the recess 17provided in the side face of the box pin 8. As a result, the engagingportion 32 provided on the bottom end of the partition plate 29 engagesan end of the recess 17, thereby the box pin 8 and the box 7 beingintegrated with each other and fixed.

[0057] When the fastener stringer 2 loaded with the insert pin 9 ismounted on the fastener stringer 2 loaded with the box 7, with a slider35 being slid to contact the top end of the box 7 and held in contacttherewith as shown in FIG. 11, the insert pin 9 is inserted into a guidegroove 37 in the slider 35 by nipping the reinforcement portion 10 ofthe fastener stringer 2 loaded with the insert pin 9. Further, theauxiliary member 11 of the reinforcement portion 10 is inserted betweenthe flanges 36 so that the insert pin 9 is inserted into the insert pininsertion hole 31 in the box 7. After that, if the slider 35 is pulledand slid by nipping the reinforcement portion 10, the fastener chain 1in which the fastener elements 4 on the right and left fastenerstringers 2 engage each other is completed as shown in FIG. 12.

[0058] When the completed fastener chain 1 is mounted on an objectfabric 42 such as clothes, the object fabric 42 is fit to the sewingposition 40 in the reinforcement portion 10 provided integrally with thebox pin 8 and insert pin 9 formed on the right and left fastenerstringers 2 as shown in FIGS. 13 and 14, the object fabric 42 and thefastener tape 3 are sewed together by a sewing machine such that asewing thread rides over the rib 13.

[0059] In the reinforcement portion 10 shown in FIG. 15, the auxiliarymember 11, which are disposed on the side face of the box pin 8 inparallel in the width direction of the fastener tape 3, is providedintegrally with the ribs 13. The ribs 13 at the sewing position 40 orthe ribs 13 having the same configuration as the ribs 13 shown in FIGS.4 and 5 are disposed at a predetermined gap portion 23 such that theyare continuous from the auxiliary member 11. Like the box pin 8, theauxiliary member 11 arranged in the width direction of the fastener tapeis provided integrally with the ribs 13 and the ribs 13 at the sewingposition 40 are disposed at the predetermined gap portion 23 such thatthey are continuous from the auxiliary member 11.

[0060] The reinforcement portion 10 shown in FIG. 16 has plural ribs 13extended toward the outside of the fastener tape 3 such that they arecurved. The ribs 13 having the same shape as the ribs 13 having thecondition shown in FIGS. 4 and 5 are extended from the side face of thebox pin 8 with the predetermined gap portion 23 up to the side edge ofthe fastener tape 3 such that they are curved together in parallel. Theribs 13 having the same shape are formed on the side face of the insertpin 9 with the predetermined gap portion 23 and the reinforcementportion 10 of this type is suitable for a small size of the fastenertape 3. In the meantime, the ribs 13 may be connected to the auxiliarymember 11 provided on the side face of the box pin 8 and insert pin 9.

[0061] In the reinforcement portion 10 shown in FIG. 17, the box pin 8and box 7 are formed integrally and the connection side of the auxiliarymember 11 of the reinforcement portion 10 is formed integrally with thebox 7, so that they are connected and fixed firmly. In the reinforcementportion 10 shown in FIG. 18, the auxiliary member 11 constituted ofoblique ribs 13 is provided integrally with the side face of the box pin8 and in this auxiliary member 11, the ribs 13 are arranged with thepredetermined gap portion 23 like the previous example such that outsideof the ribs 13 is open. In the reinforcement portion 10 shown in FIG.19, the auxiliary members 11 are provided on both the surfaces of thefastener tape 3 so that they are extended from the side face of the boxpin 8 and this auxiliary member 11 is provided with the rib 13 which isformed on a single face of the fastener tape 3 at the sewing position40. It is permissible to pull out a warp yarn (not shown) from thefastener tape located at the outer edge of the rib disposed at thesewing position so as to form a rough structure portion and then, allowa melted synthetic resin material to penetrate into the rough structurewhen the outer portion of the rib is molded on the rough structureportion so as to fix the ribs to the fastener tape strongly.

[0062] The embodiment shown in FIG. 20 shows an example applied to adouble side openable type separable bottom end stop 5. An end of onefastener stringer 2 is loaded with the box pin 8 and an end of the otherfastener stringer 2 is loaded with the insert pin 9. The right and leftfastener stringers 2 have no box 7 and two sliders 35 are mountedslidably in opposite directions so that the fastener chain 1 isopened/closed from both sides and can be separated to the right and leftsides.

[0063] The relatively long box pin 8 which two sliders 35 can pass isformed on the core portion 6 of one fastener tape 3 in this sliderfastener. A flange 36 of the slider 35 makes contact with the front endof this box pin 8 and a stopper 18 for stopping the sliding of theslider 35 is formed such that it is extended horizontally. A front endof the stopper 18 is extended up to the thick rib 13 formed at thesewing portion 40 in the reinforcement portion 10. A thin protrudedpiece 33 which is protruded sideway is provided on the top end of thebox pin 8 in step like configuration, so that it is capable ofoverlapping the step-like protruded piece 33 provided on the top end ofthe insert pin 9.

[0064] The relatively long insert pin 9 which the two sliders 35 canpass is formed on the core portion 6 of the other fastener tape 3. Theprotruded piece 33 which coincides with the protruded piece 33 of thebox pin 8 and overlap the protruded piece 33 is provided on the top endof the insert pin 9. The auxiliary member 11, 11 of the reinforcementportions 10, 10 are formed such that its end side is expanded so as tocoincide with a blade of the slider 35 in order to allow the wide bladeson the shoulder side of the slider 35 to pass.

[0065] As for the usage condition of the separable bottom end stop 5,with two sliders 35 mounted on the fastener stringer 2 loaded with thebox pin 8 such that they are directed in opposite directions, the slider35 is kept in contact with the stopper 18 of the box pin 8, the insertpin 9 of the fastener stringer 2 loaded with the insert pin 9 isinserted. Then, the slider 35 located upper is pulled upward so as toengage the fastener elements 4 on the right and left fastener stringers2 with each other, thereby completing the fastener chain 1. To separatethe fastener chain 1, if the fastener stringer 2 loaded with the insertpin 9 is pulled out of the two sliders 35 after those two sliders 35 arepulled down to the stopper 18, the right and left fastener stringer 2can be disconnected and released.

[0066] The slide fastener with the separable bottom end stop has theabove-described configuration and with this configuration, followingeffects are exerted.

[0067] That is, fastener elements are attached to opposing side edges ofa pair of fastener tapes and there are provided a separable bottom endstop made of synthetic resin which is attached by integral molding tothe side edge of the fastener tape at an end portion of the fastenerelements, and a reinforcement portion provided integrally with theseparable bottom end stop such that they are exposed on at least oneface of the fastener tape. The reinforcement portion is formed of pluralribs connected to the separable bottom end stop. The ribs are formed atthe sewing position such that its height H is 0.5 to 0.85 mm and itswidth W is 0.6 to 0.9 mm and that it is expanded gradually from itsvertex to the base portion. There is provided a gap portion wider thanthe base portion of the rib between the ribs. Accordingly, theconfiguration of the rib at the sewing position in the reinforcementportion is specified and consequently, when the reinforcement portion issewed to a sewing object, the rib can avoid strike of the sewing needleeasily. As a result, the ribs are prevented from being damaged and usingthe gap portion, the reinforcement portion can be sewed accurately andfirmly.

[0068] In addition to the above-described structure, the ribs at thesewing position in the reinforcement portion is provided with thechamfered portion by chamfering the vertex thereof and the chamferedportion is formed into an arc-like configuration having a radius of 0.05to 0.1 mm in its lateral section. Accordingly, the ribs can shift thefront tip of a sewing needle smoothly when the reinforcement portion issewed to a sewing object so as to prevent damage of the ribs. Further,because the size S of the gap portion between adjacent ribs at thesewing position in the reinforcement portion is 2.0 to 2.5 mm and theribs are disposed in parallel in the width direction, the ribs locatedat the sewing position in the reinforcement portion can be sewed easilyand the reinforcement portion can be fixed firmly to the sewing objectusing the gap portion effectively.

[0069] Regarding the ribs at the sewing position in the reinforcementportion, the degree of an inclination of the rib at its base portion isindicated by tan θ=H/(W/2) while the tan θ satisfies 1.1≦tan θ≦2.9 andthe inclination angle of the rib at the base portion is set in a rangeof 55° to 70°. Accordingly, the sewing needle is shifted awayeffectively by the slope of the rib inclined at such a specific anglewhen the ribs located at the sewing position in the reinforcementportion is sewed, so that they can be sewed effectively.

[0070] Because the ribs at the sewing position in the reinforcementportion are disposed on the side face of the separable bottom end stopthrough the auxiliary member, they are optimum reinforcement portion fora large size slide fastener and can be sewed to the sewing objecteffectively. Further, because the ribs at the sewing position in thereinforcement portion are disposed directly on the side face of theseparable bottom end stop, they are optimum reinforcement portions for asmall size slide fastener and they can be sewed to the sewing objecteffectively.

[0071] Further, because the ribs at the sewing position in thereinforcement portion are disposed symmetrically on both the front andrear surfaces of the fastener tape, the ribs avoid strike of the sewingneedle securely even if the fastener tape is sewed from any side, sothat the fastener tape can be sewed smoothly and strongly, therebyproducing an excellent quality product. Thus, the effects produced bythe present invention are very remarkable.

What is claimed is:
 1. A slide fastener with a separable bottom end stopin which fastener elements are attached to opposing side edges of a pairof fastener tapes, comprising the separable bottom end stop made ofsynthetic resin which is attached to the side edge of the fastener tapeat an end portion of the fastener elements, and a reinforcement portionprovided integrally with the separable bottom end stop extended towardat least one face of the fastener tape, the reinforcement portions beingformed of plural ribs connected to the separable bottom end stop,wherein the ribs are formed at a sewing position to an sewing objectsuch that its height H is 0.5 to 0.85 mm and its width W is 0.6 to 0.9mm and that they are expanded gradually from a vertex to a base portionand there is provided a gap portion wider than the base portion of therib between the ribs.
 2. The slide fastener with the separable bottomend stop according to claim 1, wherein the rib at the sewing position inthe reinforcement portion has a chamfering portion whose vertex ischamfered.
 3. The slide fastener with the separable bottom end stopaccording to claim 2, wherein the chamfering portion of the rib isformed into an arc-like configuration having a radius r of 0.05 to 0.1mm in a sectional shape.
 4. The slide fastener with the separable bottomend stop according to claim 1, wherein a size S of the gap portionbetween the adjacent ribs at the sewing position in the reinforcementportion is 2.0 to 2.5 mm while the ribs are disposed in parallel in awidth direction of the fastener tape.
 5. The slide fastener with theseparable bottom stop end according to claim 1, wherein an inclinationangle of the rib on the base portion at the sewing position in thereinforcement portion is indicated by tan θ=H/(W/2) while tan θsatisfies 1.1≦tan θ≦2.9.
 6. The slide fastener with the separable bottomend stop according to claim 5, wherein the inclination angle θ is in arange of 55° to 70°.
 7. The slide fastener with the separable bottom endstop according to claim 1, wherein the ribs at the sewing position inthe reinforcement portion are disposed through an auxiliary memberprovided on the side face of the separable bottom end stop.
 8. The slidefastener with the separable bottom end stop according to claim 1,wherein the ribs at the sewing position in the reinforcement portion aredisposed directly on the side face of the separable bottom end stop. 9.The slide fastener with the separable bottom end stop according to claim1, wherein the ribs at the sewing position in the reinforcement portionare disposed symmetrically on both front and rear faces of the fastenertape.